HARDtalk - Colonel Lawrence Wilkerson

George Bush's presidency has another twelve months to go but global attention is already turning to the race to succeed him. With US troops in Iraq and Afghanistan, turmoil in Pakistan and a tense stand off with Iran just how much room for manoeuvre will the next President have to change foreign policy? Colonel Lawrence Wilkerson was Colin Powell's Chief of Staff when he was Secretary of State. Stephen Sackur asks him what lessons the Bush years hold for the next occupant of the White House.